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Prepn process of blending/compounding permeation vaporizing film

A pervaporation membrane and blending technology, applied in chemical instruments and methods, separation methods, semi-permeable membrane separation, etc., can solve the problems of no practical significance and application value, and achieve the effect of low price

Inactive Publication Date: 2007-11-14
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using cellulose diacetate and ethylene-vinyl acetate membrane alone to separate methanol / methyl-tert-butyl ether mixed system has no practical significance and application value

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] 2g of ethylene-vinyl acetate with a vinyl acetate content of 32 (w / w)% was dissolved in 20ml of cyclohexane and completely dissolved at 45°C, then 180ml of dioxane and 18g of cellulose diacetate were added, magnetically Stir until completely dissolved to obtain a homogeneous transparent solution. The filtered and defoamed casting liquid is coated on the polyultrafiltration membrane, and the pervaporation membrane is obtained after the solvent is volatilized under the conditions of temperature 25-35 DEG C and relative humidity 65-80%. The pervaporation separation performance of blended / composite membranes for methanol / methyl-tert-butyl ether mixtures, when the concentration of methanol in the feed liquid is 5 (w / w), and the operating temperature is 35 ° C, the separation factor is 195, Flux of 2800μm g / m 2 h.

Embodiment 2

[0012] 2g of ethylene-vinyl acetate with a vinyl acetate content of 32 (w / w)% was dissolved in 20 ml of four

[0013] Dissolve completely in hydrofuran at 45°C, then add 180 ml of dioxane and 18 g of cellulose diacetate, stir under magnetic force until completely dissolved, and obtain a uniform and transparent solution. The filtered and defoamed casting solution is coated on the ultrafiltration membrane, and the pervaporation membrane is obtained after the solvent is volatilized under the conditions of the temperature of 25-35°C and the relative humidity of 65-80%. The pervaporation separation performance of blended / composite membranes for methanol / methyl-tert-butyl ether mixtures, when the concentration of methanol in the feed liquid is 10 (w / w) and the operating temperature is 35 ° C, the separation factor is 206, Flux of 3100μm g / m 2 h.

Embodiment 3

[0015] 2g of ethylene-vinyl acetate with a vinyl acetate content of 32 (w / w)% was dissolved in 20ml of chloroform and completely dissolved at 45°C, then 180ml of dioxane and 18g of cellulose diacetate were added and stirred under magnetic force until completely dissolved to obtain a homogeneous transparent solution. The filtered and defoamed casting solution is coated on the ultrafiltration membrane, and the pervaporation membrane is obtained after the solvent is volatilized under the conditions of the temperature of 25-35°C and the relative humidity of 65-80%. The pervaporation separation performance of blended / composite membranes for methanol / methyl-tert-butyl ether mixtures, when the concentration of methanol in the feed liquid is 5 (w / w) and the operating temperature is 35 ° C, the separation factor is 204, Flux of 3750μm g / m 2 h.

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PUM

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Abstract

The preparation process of blending / compounding permeation vaporizing film includes dissolving EVA in organic solvent; adding dioxane and mixing homogeneously; adding CA and dissolving to obtain homogeneous film casting solution of dissolving temperature 35-45 deg.c; filtering and debubbling the film casting solution; painting on ultrafiltering film and evaporating solution to obtain the blending / compounding permeation vaporizing film. The present invention features using EVA as the second component, adopting mixed organic solvent, non-conventional dissolving to prepare EVA / CA blending solution, and further preparation of the blending / compounding permeation vaporizing film. The blending / compounding permeation vaporizing film has excellent organic mixture separating performance and is easy to prepare.

Description

technical field [0001] The invention relates to the fields of polymer material preparation and membrane separation, in particular to a preparation method of a blend / composite pervaporation membrane. technical background [0002] Membrane separation technology is a high technology adapted to the development of contemporary new industries. It uses natural or artificially prepared membranes with selective permeation properties to separate, classify, purify or enrich two-component or multi-component liquids or gases. . Developed countries in the world clearly stated: "In most industries in the 21st century, membrane separation technology plays a strategic role." Academician Li Nianzhi, a world-renowned chemistry and membrane expert, said when he visited my country: "Whoever masters membrane technology, hold the future of the chemical industry in their hands.” Therefore, membrane separation technology has become an important separation process in the fields of chemical industry,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/12B01D53/22
Inventor 安全福钱锦文
Owner ZHEJIANG UNIV